Back to Basics in Landfill Leachate Treatment

Landfill leachate is generated from liquids existing in the waste as it enters a landfill or from rainwater that passes through the waste within the facility. The leachate consists of different organic and inorganic compounds that may be either dissolved or suspended. An essential part of maintaining any landfill is managing the leachate through proper treatment methods designed to prevent pollution into surrounding ground and surface waters. Even when a landfill is located in an arid area, leachate may be produced during wet weather periods, and its consideration remains necessary, although management may be by evaporation in many cases.

If leachates have a distinguishing characteristic, it is that flows are variable. Flows change according to the weather. The highest leachate generation will occur after rainy periods, decreasing during dry and when the leachate from previous events ceases to percolate through the waste and appear at the base of the landfill. Therefore, waste concentrations can change dramatically according to the weather conditions and as the waste matures over the life of the landfill. It follows that, no landfill leachate is constant over time, and no two leachates are the same. However, large landfills operated according to the EU landfill directive with less than 50% recycling taking place before it reaches the waste are remarkably similar when age of waste and leachate is taken into account.

Landfill Leachate Treatment Strategies

Landfill leachate treatment strategies can vary quite considerably subject to the individual challenges on each site as well as relative strengths, composition and volumes of leachate. The experts at the "Leachate Expert website" (see www.leachate.co.uk ) have designed dozens of successful leachate treatment facilities over the last 25 years, and can assist you in the specification, design, build, installation & commissioning of the most appropriate solution for your site. Naturally, we can thereafter provide operation and maintenance services.

Based on a minimum of information the leachate experts work with their clients to provide a practical and economical process design which will then form the foundation of the project. Each project consultancy involvement can range from providing feasibility studies, design layouts and process flows, to project management, specification, construction procurement, landfill product selection, HAZOPs, P&IDs, etc, and plant operational support.

A very wide range of treatment processes have been applied to leachate treatment with varying success. The processes which have been consistently successfully applied, for municipal waste landfill leachate from controlled landfills, are biological processes designed by specialist leachate process designers.

In many countries standard national discharge consents limit the applicability of biological processes due to their high stringency of the purity requirements, and removal of salts. Thus can be the result of consents which are designed for simplicity as national standards, and which adopt a requirement that all discharges must meet a high quality standard suitable for all cases.

Regulators often suggest that leachate should be pumped to a sewer for treatment at a urban Wastewater Treatment Plant (WWTP). However, this may historically have been driven by concerns that leachate treatment on site is challenging and difficult to achieve reliably, than by a detailed appraisal of the best options available. This however is no longer true, especially for designs from experienced specialist LTP designers, such as those at the "Leachate Expert website".

Is Leachate Treatment at Any Sewage Works A Good Idea Environmentally?

In reality it is not usually a good policy to treat strong leachate from modern sanitary landfills after discharging it into sewer. The act of mixing it with sewage makes it more difficult to treat by sewage treatment plants. Sewage works are not designed for such high ammonia effluents. Leachate has an extremely high ammoniacal nitrogen ("ammonia”) concentration when compared with the much weaker contamination levels in domestic, commercial, and industrial foul sewage.

This is why treating strong leachate at a Wastewater Treatment Plant, as if it were sewage, is  not efficient and leads to unnecessarily cost. Unless the WWTP has a high efficiency nitrifying process set-up already ammonia removal may be very poor. The result is that ammonia, which is one of the most potentially damaging types of contaminants in leachate, may simply be being diluted by its addition to sewage which is much weaker in ammonia, and the WWT may comply with its discharge consent by dilution, and even not treat the ammonia.

Geochemistry of leachates from selected coal mining and combustion wastes (Contribution / Kansas Water Resources Research Institute)

Sanitary landfills are the most widely utilized method of solid waste disposal around the world. With increased use and public awareness of this method of disposal, there is much concern with respect to the pollution potential of the landfill leachate.

Depending on the composition and extent of decomposition of the refuse and hydrological factors, the leachate may become highly contaminated. As leachate migrates away from a landfill, it may cause serious pollution to the groundwater aquifer as well as adjacent surface waters.

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There is growing concern about surface and groundwater pollution from leachate. Better understanding and prediction of leachate generation, containment, and treatment are needed. This book contains a literature review of various methodologies that have been developed for prediction, generation, characterization, containment, control, and treatment of leachate from sanitary landfills. The contents of this book are divided into nine chapters.

Each chapter contains theory and definition of the important design parameters, literature review, example calculations, and references.

Chapter 1 is devoted to basic facts of solid waste problems current status and future trends towards waste reduction and recycling.

Chapter 2 provides a general overview of municipal solid waste generation, collection, transport, resource recovery and reuse, and disposal options. The current status of sanitary landfill design and operation, problems associated with the landfilling, and future trends are presented in

Chapter 3. Methods of enhanced stabilization, recycling landfill space, methane recovery, and above grade landfilling, and closure and post closure care of completed landfills are also discussed in detail.

Chapter 4 provides a general overview of Subtitle D regulations and its impact upon sanitary landfilling practices.

Chapter 5 is devoted entirely to moisture routing and leachate generation mechanisms. Examples of calculation procedure for determining the leachate quantity produced at a landfill are presented.

Chapter 6 is devoted to chemical characterization of leachate that changes over the life of the fill. Both theoretical and experimental results are provided to estimate the leachate quality.

Chapter 7 provides leachate attenuation processes and mechanisms.

Chapter 8 is devoted to leachate collection systems. Natural soil sealants, admixed materials and synthetic membranes, their effectiveness, and methods of installation and economics are fully discussed.

Chapter 9 provides a detailed review of leachate treatment methodology.

Kinetic coefficients and treatment plant design considerations are summarized for the sole purpose of assisting consultants to design leachate treatment facilities. Leachate treatment case histories and numerous process trains are presented for treating leachate from young landfill. The book also describes how the process train can be changed effectively as leachate quality changes with time.

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A Scheme for the analysis of pollutants in groundwater and leachates contaminated by hazardous chemicals

Sanitary landfills are the most widely utilized method of solid waste disposal around the world. With increased use and public awareness of this method of disposal, there is much concern with respect to the pollution potential of the landfill leachate. Depending on the composition and extent of decomposition of the refuse and hydrological factors, the leachate may become highly contaminated. As leachate migrates away from a landfill, it may cause serious pollution to the groundwater aquifer as well as adjacent surface waters.

There is growing concern about surface and groundwater pollution from leachate. Better understanding and prediction of leachate generation, containment, and treatment are needed. This book contains a literature review of various methodologies that have been developed for prediction, generation, characterization, containment, control, and treatment of leachate from sanitary landfills. The contents of this book are divided into nine chapters. Each chapter contains theory and definition of the important design parameters, literature review, example calculations, and references. Chapter 1 is devoted to basic facts of solid waste problems current status and future trends towards waste reduction and recycling.

Chapter 2 provides a general overview of municipal solid waste generation, collection, transport, resource recovery and reuse, and disposal options. The current status of sanitary landfill design and operation, problems associated with the landfilling, and future trends are presented in Chapter 3. Methods of enhanced stabilization, recycling landfill space, methane recovery, and above grade landfilling, and closure and post closure care of completed landfills are also discussed in detail.

Chapter 4 provides a general overview of Subtitle D regulations and its impact upon sanitary landfilling practices. Chapter 5 is devoted entirely to moisture routing and leachate generation mechanisms. Examples of calculation procedure for determining the leachate quantity produced at a landfill are presented. Chapter 6 is devoted to chemical characterization of leachate that changes over the life of the fill. Both theoretical and experimental results are provided to estimate the leachate quality. Chapter 7 provides leachate attenuation processes and mechanisms.

Chapter 8 is devoted to leachate collection systems. Natural soil sealants, admixed materials and synthetic membranes, their effectiveness, and methods of installation and economics are fully discussed. Chapter 9 provides a detailed review of leachate treatment methodology. Kinetic coefficients and treatment plant design considerations are summarized for the sole purpose of assisting con- sultants to design leachate treatment facilities. Leachate treatment case histories and numerous process trains are presented for treating leachate from young landfill. The book also describes how the process train can be changed effectively as leachate quality changes with time.

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A Survey of the Current and Potential Analytical Techniques for the Speciation of Radionuclides in Nuclear Waste Repository Groundwaters and Simulation Leachates

Sanitary landfills are the most widely utilized method of solid waste disposal around the world. With increased use and public awareness of this method of disposal, there is much concern with respect to the pollution potential of the landfill leachate. Depending on the composition and extent of decomposition of the refuse and hydrological factors, the leachate may become highly contaminated. As leachate migrates away from a landfill, it may cause serious pollution to the groundwater aquifer as well as adjacent surface waters. T

here is growing concern about surface and groundwater pollution from leachate. Better understanding and prediction of leachate generation, containment, and treatment are needed. This book contains a literature review of various methodologies that have been developed for prediction, generation, characterization, containment, control, and treatment of leachate from sanitary landfills. The contents of this book are divided into nine chapters. Each chapter contains theory and definition of the important design parameters, literature review, example calculations, and references. Chapter 1 is devoted to basic facts of solid waste problems current status and future trends towards waste reduction and recycling. C

hapter 2 provides a general overview of municipal solid waste generation, collection, transport, resource recovery and reuse, and disposal options. The current status of sanitary landfill design and operation, problems associated with the landfilling, and future trends are presented in Chapter 3. Methods of enhanced stabilization, recycling landfill space, methane recovery, and above grade landfilling, and closure and post closure care of completed landfills are also discussed in detail. Chapter 4 provides a general overview of Subtitle D regulations and its impact upon sanitary landfilling practices. Chapter 5 is devoted entirely to moisture routing and leachate generation mechanisms.

Examples of calculation procedure for determining the leachate quantity produced at a landfill are presented. Chapter 6 is devoted to chemical characterization of leachate that changes over the life of the fill. Both theoretical and experimental results are provided to estimate the leachate quality. Chapter 7 provides leachate attenuation processes and mechanisms. Chapter 8 is devoted to leachate collection systems. Natural soil sealants, admixed materials and synthetic membranes, their effectiveness, and methods of installation and economics are fully discussed.

Chapter 9 provides a detailed review of leachate treatment methodology. Kinetic coefficients and treatment plant design considerations are summarized for the sole purpose of assisting con- sultants to design leachate treatment facilities. Leachate treatment case histories and numerous process trains are presented for treating leachate from young landfill. The book also describes how the process train can be changed effectively as leachate quality changes with time.

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Composition of leachates from actual hazardous waste sites (SuDoc EP 1.89/2:600/S 2-87/043)

Treatment of landfill leachate is a challenge specially to the developing countries in the process of protecting their environment due to unaffordability of the available technologies. This study, Advanced oxidation combined with Membrane Bio- reactor (MBR) is an effort to achieve better treatment technique. It focuses on reduced need for infrastructure and smaller foot print of treatment facility by using MBR technology to perform activated sludge process. The subsequent advanced oxidation by ozone facilitates further treatment. Leachate of average age was preteated and fed into a laboratory MBR treatment module. Pretreatment efficiency and the change of MBR efficiency by recirculating the ozonated effluent were studied.

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Constructed Wetlands for the Treatment of Landfill Leachates

Constructed wetlands are proving to be the best natural treatment system for landfill leachates.Most of the contaminants in landfill leachates are degraded in treatment wetlands. Potential for long-term sustainability and significant cost savings are attractive features of this eco-technology.Documentation of the experience in this use of constructed wetlands has been limited. Constructed Wetlands for the Treatment of Landfill Leachates is the first compilation of the results of research from North America and Europe. Originally presented at an international symposium, this collection of papers offers the most recent research findings from the leading researchers in this new and innovative natural treatment system.Specific issues addressed in the text include:oleachate characteristics, and the potential for treatability by constructed wetlandsowetland treatment, processes and transformationouse of constructed wetlands in cold climatic conditionsoassessment of the tolerance of wetland plants to the toxicity of leachatesorole of plants in the treatments of leachatesointegrated wetland systemsoperformance of different wetland treatment systemsocost comparisons of wetland technology vs. traditional treatment technologiesThe potential for environmental contamination due to leachates from landfills is increasing, and there is an urgent need to find ways and means to treat leachates in a sustainable way Constructed Wetlands for the Treatment of Landfill Leachates will provide an invaluable source of information on the subject for scientists, engineers, practitioners, policy makers, and regulatory officials.

Price: $129.95

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